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Element repetition in list in Python
There are scenarios when we need to repeat the values in a list. This duplication of values can be achived in python in the following ways.
Using nested for loop
It is a straight forward approach in which pick each element, take through a inner for loop to create its duplicate and then pass both of them to an outer for loop.
Example
# Given list
listA = ['Mon', 'Tue', 9, 3, 3]
print("Given list : ",listA)
# Adding another element for each element
Newlist = [i for i in listA for n in (0, 1)]
# Result
print("New list after duplication: ",Newlist)Output
Running the above code gives us the following result −
Given list : ['Mon', 'Tue', 9, 3, 3] New list after duplication: ['Mon', 'Mon', 'Tue', 'Tue', 9, 9, 3, 3, 3, 3]
Using itertools
The itertools module deals with data manipulation in iterables. Here we apply the chain.from_iterables which
Example
import itertools
# Given list
listA = ['Mon', 'Tue', 9, 3, 3]
print("Given list : ",listA)
# Adding another element for each element
Newlist = list(itertools.chain.from_iterable([n, n] for n in listA))
# Result
print("New list after duplication: ",Newlist)Output
Running the above code gives us the following result −
Given list : ['Mon', 'Tue', 9, 3, 3] New list after duplication: ['Mon', 'Mon', 'Tue', 'Tue', 9, 9, 3, 3, 3, 3]
With reduce
The reduce function applies a particular function passed to it as an argument to all of the list elements passed onto it as second argument. We use this with add function which adds the duplicate element of each element present in the list.
Example
from functools import reduce
from operator import add
# Given list
listA = ['Mon', 'Tue', 9, 3, 3]
print("Given list : ",listA)
# Adding another element for each element
Newlist = list(reduce(add, [(i, i) for i in listA]))
# Result
print("New list after duplication: ",Newlist)Output
Running the above code gives us the following result −
Given list : ['Mon', 'Tue', 9, 3, 3] New list after duplication: ['Mon', 'Mon', 'Tue', 'Tue', 9, 9, 3, 3, 3, 3]
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